A high capacity watermarking for H.264/AVC based on frequency weighting

Jun-Yan Hsieh, Long-Wen Chang
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引用次数: 6

Abstract

A low complexity watermarking method in the compressed domain for H.264 is proposed. It embeds the watermark in a quantized 4times4 coding block. Because DC coefficient affects the quality of video very much, we just modify the remaining 15 AC coefficients for embedding the watermark. We divide the AC coefficients in the embeddable block into two groups. The coding block is embeddable if the watermark embedding function of the coefficients in these two groups is greater than a threshold. It is embeddable. The block is embedded with 1 or 0 according to the weighting functions of these two groups. The proposed method has higher capacity and could resist basic recompression attack by mean of comparing other algorithms. The experiment result shows the proposed method could maintain video quality.
基于频率加权的H.264/AVC高容量水印
提出了一种H.264压缩域的低复杂度水印方法。它将水印嵌入到一个量化的4times4编码块中。由于直流系数对视频质量的影响很大,我们只需要修改剩余的15个交流系数就可以嵌入水印。我们将可嵌入块中的AC系数分为两组。如果这两组系数的水印嵌入函数大于一个阈值,则编码块是可嵌入的。它是可嵌入的。根据这两组的权重函数,将块嵌入1或0。通过与其他算法的比较,该方法具有更高的容量,能够抵抗基本的再压缩攻击。实验结果表明,该方法能够保持视频质量。
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