【摘要】 为了增强视频通信系统在有误码信道的适应能力 ,提出了一种基于数字水印技术的错误检测方法 ,使得解码器可以对误码块进行有效的补偿。其原理为编码器在量化后离散余弦变换 (DCT)系数中嵌入易碎的数字水印 ,解码器可以通过提取水印从而确认错误以及错误发生的首宏块位置。仿真结果证明 :在信道误码率为 5× 10 - 4时 ,与常用的基于语法的方法相比 ,本方法的错误检测率是其的 1.32～ 1.82倍 ,错误正确定位率是其的 2 .95～ 5 .32倍 ,而且 PSNR只有微弱降低 ,同时算法复杂度很低更多还原

【Abstract】 An embedded watermarking error detection scheme, which enables an efficient error concealment and video communication over error prone channels, is proposed. A particular fragile watermark hidden in the DCT coefficient at the encoder provides on easy way to detect errors and their locations at the decoder. The simulation results showed that the error detection rate 1.32~1.82 times and the error correctly location rate 2.95~5.32 times of the widely used syntax based error detection technique at a channel bit error rate of 5×10 -4 is obtained by the proposed scheme. The proposed method has a slightly PSNR decreasing and has a very low complexity.更多还原