H.263活动图像编码器抗误码技术研究

Studies of error resilient technologies for H.263 video coder

为提高 H.2 6 3活动图像编码器在有信道误码环境中的性能 ,提出了一种交互式抗误码方案 ,包括同步头的自适应塞入策略 ;解码过程中的误码检测、误码定位和误码掩盖 ;编码端基于动态规划的最佳编码模式选择三部分。提出了一种新的解码信息的反馈方法 ,不需要专门的反馈信道 ,直接把解码信息复接到 H.2 6 3码流中。所用的抗误码技术不改变标准 H.2 6 3码流的语法结构 ,不影响兼容性 ,增强了H.2 6 3活动图像编码器的稳健性。模拟结果表明 。

An interactive error resilient scheme is proposed to improve the performance of H.263 video coder in error prone channels without losing compatibility. The robust H.263 video coder uses resynchronization flags insertion, error detection, localization and concealment in the decoder, and dynamic programming mode selection based on error tracking in the encoder. A novel decoding information feedback method is described which utilizes the H.263 video bit stream but does not modify its syntax. This error resilient scheme does not modify the syntax standard of the H.263 bit stream to keep its compatibility. Simulation results demonstrate that this error resilient H.263 coder provides good video quality in rate limited noisy channels.