随着无线网络和多媒体技术应用的广泛和深入,在不可靠信道上传输视频的需求日益增长,视频编码和传输中的错误控制问题已经引起了广泛关注.本文全面回顾了过去10多年来的容错编码与传输技术,包括基于编码端的容错、基于解码端的差错掩盖以及信源信道联合编码.此外还对最新的视频编码标准H.264/AVC的容错工具进行了介绍并展望了容错视频编码与传输技术的发展方向.

With the development of wireless network and multimedia technology, error control technology in video coding and video transmission over lossy channels has been widely studied. This paper reviewed the error-resilient coding and transmission technology, including encoder based error resilience, decoder based error concealment, network based error control and joint source and channel coding. In error resilience, redundant information is added into the bitsream to confine the error propagation. Error concealment estimates or recovers the losing data making use of the character that most nature scenes change smoothly between neighbor blocks. Network based error control, joint source and channel coding utilize the channel feedback information to guide the encoder to make an optimum decision. Additionally, error resilient tools in the latest video coding standard H. 264/AVC and the preview of the future error resilient technology are also considered. Experiments indicate that the proposed error resilient methods are effective in video transmission over lossy channels.