Color Image Blind Watermarking Algorithm Based on QR Decomposition and Voting in DWT Domain

Color Image Blind Watermarking Algorithm Based on QR Decomposition and Voting in DWT Domain
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基于QR分解和DWT域投票的彩色图像盲水印算法

DOI:
10.14257/ijsia.2016.10.11.04
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发表时间:
2016-11
期刊:
International Journal of Security and Application
影响因子:
--
通讯作者:
朱永红
朱永红
中科院分区:
其他
文献类型:
--
作者:
王俊祥;刘英;朱永红

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为了在鲁棒性和不可感知性之间取得更好的权衡,本文提出了一种基于QR分解和DWT域彩色图像投票的盲水印算法。大多数现有的基于 QR 分解的水印方案都考虑 R 矩阵的第一行,而在我们的方法中,通过修改 Q 矩阵的第一列元素来嵌入水印。在嵌入过程中,DCT分别应用于R、G和B颜色分量。然后对各分量的DCT系数进行DWT,得到相应的LL、HL、LH、HH。随后,利用QR分解对LH和HH中相关的DWT系数进行分解,并通过改变特性稳定的Q 21 和Q 31 将水印消息嵌入到Q矩阵的第一列中。在提取阶段,采用投票法的冗余水印方案来提高水印算法的鲁棒性。实验结果表明,与现有方法相比,该算法具有足够的鲁棒性,可以抵抗滤波、噪声、小切割和JPEG压缩等常见信号攻击。
To achieve a better trade-off between robustness and imperceptibility, a blind watermarking algorithm based on QR decomposition and voting for color image in DWT domain is proposed in the paper. Most of the existing QR decomposition based watermarking schemes take the first row of R matrix into consideration while in our approach the watermark is embedded by modifying the first column element of Q matrix. In the embedding process, DCT is applied to the R, G and B color components, respectively. Then DWT is utilized on the DCT coefficients of each component and acquire corresponding LL, HL, LH, and HH. Later, the associated DWT coefficients in LH and HH are decomposed with QR decomposition and the watermark message is embedded into the first column of Q matrix by changing Q 21 and Q 31 with stable characteristic. In the extraction phase, a redundant watermark scheme with voting method is used to improve the robustness of the watermarking algorithm. Experimental results show that the proposed algorithm, compared with the existing methods is robust enough to resist common signal attacks including filtering, noising, small cutting and JPEG compressing.
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