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差错复原技术已成为易发生差错信道下视频编码的重要组成部分。本文实现了一个基于数据分割和可逆变长编码的具有差错复原性能的 H.2 63编解码器。通过利用数据分割、可逆变长编码、差错掩盖等技术 ,并利用第三代移动通信系统的信道差错模型对该编解码器的差错复原能力进行了实验。实验结果表明 ,在无线移动信道的恶劣环境下 ,在综合利用多种差错复原技术后 ,重建图像的主客观质量得到了明显的改善。
Error recovery technique has become an important part of video coding in error prone channel. This paper implements an H.263 codec with error resilience based on data partitioning and reversible variable length coding. Through the use of data segmentation, reversible variable length coding, error concealment and other technologies, and the use of third generation mobile communication system channel error model of the codec error resilience experiments. The experimental results show that the subjective and objective quality of the reconstructed image has been significantly improved under the harsh environment of the wireless mobile channel after comprehensive utilization of multiple error recovery techniques.