Towards Fast and Robust Watermarking Scheme for H.264 Video
Towards Fast and Robust Watermarking Scheme for H.264 Video
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DOI：
10.1109/ism.2008.16
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发表时间：
2008-12
期刊：
影响因子：
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通讯作者：
Xun Gong;Hai-Ming Lu
中科院分区：
文献类型：
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作者：
Xun Gong;Hai-Ming Lu
现有的大多数H.264水印方法要么需要大量的时间开销，要么对有意的攻击相当脆弱。本文提出了一种新的水印算法，该算法同时满足了快速性和鲁棒性的要求。该方案通过修改亮度残差块中的量化DC系数，在解码端直接将水印嵌入到H. 264码流中。为了提高鲁棒性，同时保持视频的感知质量，我们采用了基于纹理掩蔽的感知模型来自适应地选择每个块的水印强度。基于解码器的水印算法的一个关键问题是误差漂移，它是指在帧内或帧间预测过程中不同块之间的水印误差累积。为了消除误差漂移的影响，我们提出了一种漂移补偿算法，通过估计每个块的补偿信号嵌入水印位。实验结果表明，该水印具有较好的不可感知性和抵抗常见攻击的能力。此外，我们的计划是更快，并导致更少的比特率增加比以前的方法。
Most available H.264 watermarking methods either require large expense of time or are rather fragile to intended attacks. In this paper, we present a novel watermarking scheme, which satisfies with the requirements of both rapidity and robustness. The proposed scheme directly embeds watermarks into H.264 bit streams at the decoder by modifying the quantized DC coefficients in luma residual blocks. To increase the robustness while maintaining the perceptual quality of the video, we employ a texture-masking-based perceptual model to adaptively choose the watermark strength for each block. A crucial problem of decoder-based watermarking algorithms is error drift, which refers to the watermark error accumulations among different blocks during intra or inter predictions. To eliminate the effects of error drift, we propose a drift compensation algorithm by estimating a compensation signal for each block before embedding the watermark bit. Experimental results show that the watermarks are highly imperceptible and resistant to common attacks. In addition, our scheme is faster and causes less increase in bit rate than previous methods.