| The telephone as essential to modern life in the communications tool, has become increasingly widespread penetration into all aspects of life, especially with the continuous application of 3G technology, video telephony, gradually began to emerge and begin to affect people's lives, visualization appearance of the phone calls to meet the people under the premise of meeting people for more images, video demand generated. Videophone is mainly based on the development of network and video compression technology developed, in which any one related to technological innovation will affect it, video compression, still image compression, audio compression technology will promote the development of changes videophone technology to move forward. As a videophone important part of the video image visualization is one of the most critical applications, therefore, video technology, compression technology, transmission, communication is the key.Video image as a visual key to the call of its compression technology related to its transmission and communication theory, therefore, a variety of video coding techniques and coding techniques, compression techniques is to determine the different types of video applications, the point. International Organization for Standardization (ISO), International Electrotechnical Commission (IEC) and International Telecommunication Union (ITU) a subsidiary of International Telegraph and Telephone Consultative Committee (CCITT) successively completed a variety of data compression and communications standards and recommendations, such as for still image compression The CCITT T.81 and ISO 10918 (JPEG) standards in the moving images in video conferencing for the CCITT H.261 (Px64) standard for video telephony CCITT H.263 standard for VCD's ISO 11172 (MPEG-1) and for broadcast television and DVD, ISO/IEC 13818 (MPEG-2) standards, and applicable to the low transmission rate of the MPEG-4 program.LAN as the most likely to build networks, is the most extensive range of applications of computer network, its convenience, practicality get the people's recognition, learning sample, party and government organs, enterprises and institutions can be set up according to their actual situation within their own local area network, and in order to achieve the file sharing, file transfer, net communications, video, television, telephone conference, as a campus LAN an important visual component of the LAN hardware configuration is also related to whether the visual communication to ensure effective implementation. In the establishment of local area network, first according to size and application, respectively some of the features and performance of different network equipment.As a local area network extension, wireless networks and settings in the environment conditions, more than traditional wired networks. With the development of personal data communications, powerful portable data terminals and multimedia terminals, wide application, in order to achieve any person at any time, any place can achieve data communication target for traditional computer networks from wired to wireless, from the fixed to mobile, from a single business to multi-media development, and further promote the wireless local area network (Wireless LAN) development. Although today's wireless local area network can not be completely divorced from the wired network.In the study of image and video compression technology and build the basis of visual communication on campus network, to be addressed is that in the known image compression technology and local area network build is complete, the need for software to complete video calls within a local area network, as an important means of communication, software design, development has an extremely important role, especially within the campus network to achieve video calls, to have studied the images, video and voice compression technology, by means of VC+ + to finalize the software The design, and ultimately video calls within the campus network research. |
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