基于LDPC码的MPEG-4鲁棒数字水印

Robust Digital Watermarking for MPEG-4 Based on Low Density Parity Check Coding

提出了一种基于LDPC码的MPEG-4视频水印方案,利用LDPC码的纠错性能和人眼视觉特性在MPEG-4视频中实现数字水印的嵌入和提取.嵌入前先对水印信息进行LDPC编码,将处理后的水印嵌入到视频I-VOP亮度分量的中频系数中.盲提取时用LDPC迭代译码算法对提取的水印信息进行译码.实验表明,该方案降低了水印在传输中的误码率,有效提高了抗攻击能力,对于常见的视频攻击具有较强的鲁棒性.

A new digital watermarking algorithm for MPEG-4 video based on low density parity check（LDPC） coding is proposed.The watermark is embedded into and retrieved from the MPEG-4 video using the LDPC coding technique and human visual characteristics.The watermark is first encoded with LDPC before embedding into the intermediate frequency coefficients of the luminance components of the I-VOP.The watermark is retrieved blindly from the marked video using the LDPC iterative method.Experimental results show that the proposed algorithm can decrease errors in the extracted watermark and is robust to common video attacking.