In this paper , the theory and implementing method of video encoder based on the itu - t h . 263 video coding for low bit rate communication standard are studied deeply in order to satisfy the demand of narrow - band video communication 为了在窄带信道上实现视频通信，本文对基于itu - t的低比特率视频通信编码标准h 263的视频编码器的原理和实现方法作了深入的研究。
In the first part , internet structure and related protocols are analyzed , including tcp , rtp / rtcp schemes and network parameter measurement . in the second part , video coding principle and the issued standards , such as h . 261 , h . 263 , and mpeg - 4 are investigated 首先分析了与视频通信相关的网络结构和协议，对tcp 、 rtp rtcp机制以及网络参数的测量方式作了详细的分析。
With the rapid development of digital communication technology , the mature of image compression techniques and the publication of international standards , video communication has came into human ’ s daily life and works 近年来,随着数字通信技术的迅速发展,图象压缩技术的日渐成熟,以及相关国际标准的制定和网络的兴起,视频通信逐渐应用到了人们的日常生活和工作中。
They make image coding and wireless transmit technologies to be hot research points . in this thesis , we made theory analysis on image communication , including video capture , source coding , modulation , and communication protocol 本论文对无线视频通信的各个环节，包括信号的采集、信源编码、通信协议、信道调制，进行了全面的理论分析，提出一种高效实用的无线视频通信方案。
Many international video compression standards have been established for various video applications , such as mpeg , h . 26x . for different applications , video data follows different formats and standards , for example the bit rate , frame rate , spatial resolution 现阶段视频通信领域，存在多种编码标准，由不同的组织，针对不同应用场合制定，如mpeg标准， h . 26x标准等。
For example , the , higher qulity video phone and video conference ; video store and display with higher resolution ; video communication in wireless network ; etc . but a key technology in all these application is video encode and decode 例如更高质量的可视电话和视频会议，具有更高清晰度的视频存储和播放，无线网络中的视频通信等。这些应用中一个关键的技术环节是图像的压缩和解压缩。
The main points are as follows : first , current video applications are classified by their communication modes , the network parameters are discussed in detail which affect the quality of video communications and the performance of typical networks are described 本文主要内容如下：第一：比较了不同视频业务的通信模式，并结合目前典型的通信网络，详细分析了影响视频通信服务质量的网络性能参数。
Arq ( auto repeat on request ) is used in data communication to garauntee error - free transmission , but it is not suitable for video communication because video communication has stringent delay requirement and limitless retransmission is not allowed 传统的数据通信通过出错重传的方法保证数据的无差错传输，但是这种方法不适合实时视频通信。因为视频通信对延迟有严格的要求，不可能使用无限制的重传。
