Packetization And Transmission Of H.263 Bitstream

There is growing interest in video coding technology and its applications over networks such as: video telephony and videoconferencing, security monitoring, interactive games, telescoping, and other value-added services. The limited transmission rate available on the Public switched telephone network (PSTN) and on wireless networks presents a significant challenge to digital video communications. Digital wireless communication, which has gained wide spread acceptance recently, is also limited in available transmission rate to a few kilobits per second. Therefore, there is an increasing interest in video coding at such low bit rates. Several international standards have been adopted for video compression, each serving a different type of application: Joint Photographic Experts Group (JPEG), International Telecommunications Union Telecommunications Standards Sector (ITU-T), and Motion Picture Experts Group (MPEG). Although the general source model used in these standardized coding algorithms provides only a basic and incomplete description of video scenes in general, very good picture quality is obtained at several megabits per second; picture quality acceptable for some applications is reached at 64 kb/s. However, below 64 kb/s these algorithms lead to annoying blocking artifacts or require operation at low frame rates, resulting in low temporal resolution and long end-to-end delay. Therefore, further coding improvements are required to reach an acceptable picture quality at these low bit rates.The purpose of this thesis is to study about the video-coding standard targeted for low-bit-rate video coding technique (H.263) that improves video quality considerably. Future multimedia services may require new functionalities for coding algorithms in future standards. Thus, designing coding, protocols and mechanisms for real time video transmissions over the Internet poses many challenges.This thesis tackles problems in both coding and transmission. For coding, a hybrid coding scheme is proposed to increase the robustness. For transmission, an effective packetization algorithm is designed to minimize packet loss damage. We demonstrate that by understanding the Internet video traffic loss behavior and properly balancing the bit rate and robustness through improved frame coding and efficient frame packetization, a low bit rate and robust Internet video coding and transmission scheme can be realized.