However , there are some inherent problems in wireless channels and internet that affect video delivery , such as limited bandvvidth , varying delay and high levels of noise 然而由于有限的带宽和恶劣的通信环境，使得窄带高噪声成为无线和互联网视频通信的难点。
With the rapid development of network technology and wide use of network multimedia , video communication attains increasing attention and is widely applied 随着网络技术的快速发展与网络多媒体应用的普及,基于因特网的视频通信受到越来越多的关注,并得到了广泛应用。
Along with the development of multimedia , image processing and computer network technologies , most of the largest companies are marching into the market of low bitrate video products 随着多媒体、图像处理、计算机及网络等技术领域的进展，通信已发展到视频通信阶段。
This thesis has focused on the key technologies of video transmission system , including fine granular scalable video coding , congestion control and error control technology 然而，由于视频的信息量大，且internet又是尽力型网络，因此internet上的视频通信也是一个研究难点。
Navigation progressively improved , from inertial systems to a camera with a video link , but by 1973 the drone still missed about half its targets 导航系统日复一日地得到了提高：从惯性制导系统发展到拥有视频通信的摄像系统，但直到1973年，无人机仍会错过对一半的目标的攻击。
Digital video is much better than analog video , the development of digital video accelerates the development of multimedia , video communication and digital tv 数字视频比模拟视频具有多种明显的优点,它的发展推动了多媒体、视频通信和数字电视等产业的飞速发展,具有重要的研究意义。
With the emergence of the third - generation ( 3g ) mobile communication system and quick development of ip network , image / video communication is becoming one of major communication services 随着第三代移动通信系统的出现和ip网络的迅速发展,图象/视频通信正逐步成为通信的主要业务之一。
A simple , fast , effective and economic wireless image communication system is proposed and it is implemented successfully on ieee802 . 11b wireless lans based on vc + + programming and orinoco network card 并采用visualc + +软件编程和orinoco无线网卡在802 . 11无线局域网上成功实现该视频通信方案。
This brings great difficulty to transmit and store information and also affects the development of video communication . to solve this problem , we must apply the video coding technology 本文首先简单的介绍了视频压缩编码技术的发展情况、该技术在视频通信业务中的重要性以及研究本课题的意义。
The forepart of an video communication system is very important not only in traditional field , such as broadcast television , but also in rising field , such as the video service on internet , vod 在传统的广播电视领域、娱乐领域和新兴的internet视频业务领域，视频通信系统的前端都是关键的设备。
