Investigation of Error Resilient Techniques in MPEG-4 Video Communication over Error-Prone Wireless Networks

• Main Authors: Tu-Chun Yin, 殷圖駿
• Other Authors: Wen-Chin Chen
• Format: Others
• Language: en_US
• Published: 2004
• Online Access: http://ndltd.ncl.edu.tw/handle/05909240138220859436

碩士 === 國立臺灣大學 === 資訊工程學研究所 === 92 === An MPEG-4 video error resilient evaluation system is developed in this thesis. The system comprises an error-resilient encoder, an adaptive error-resilient transcoder, an error-resilient decoder, a network error simulator, a PLBP encoder and a PLBP decoder. Wireless channels may cause three types of error in the output of network layer, namely packet loss error, random error and burst error.　With appropriate configuration set on the network error simulator, performance of various error-resilient techniques can be evaluated over the simulated wireless channel. To facilitate MPEG-4 video communication over error-prone wireless channel, an Error-Resilient Strategy is proposed in this thesis. In order to provide protection on the MPEG-4 bitstream, the ER strategy integrates three proposed novel error resilient techniques, namely Prioritized-Level Bitstream Protection (PLBP), Protected Data Partitioning (PDP) and Restorative Intra Adoption (RIA), and, in addition, error resilience tools defined in MPEG-4 video standard, namely Video Packet Structure, Header Extension Code (HEC) and NEWPRED. In the decoder side, three error concealment techniques are implemented in the decoder, namely Temporal Replacement, Motion Replacement, and Predictive Motion Replacement. The decoder also implements a powerful error detection mechanism that has high sensitivity to detect errors. Finally, the performance of the proposed ER strategy is evaluated in the system with WCDMA configuration. WCDMA is the next generation mobile communication protocol and one of its killer-application is video streaming. The experimental results show that in error-prone conditions of WCDMA network, acceptable video quality is successfully retained without incurring much overhead.