随机水印生成的抗剪切攻击彩色图像鲁棒盲水印算法  

Robust blind watermarking method for color images resistant to shear attacks based on random watermark generation

作　　者：白健平 杜庆治[1] 龙华[1,2] 邵玉斌 贺阳[1] BAI Jianping;DU Qingzhi;LONG Hua;SHAO Yubin;HE Yang(Faculty of Information Engineering and Automation,Kunming University of Science and Technology,Kunming 650504,China;Key Laboratory of Media Convergence,Kunming 650228,China)

机构地区：[1]昆明理工大学信息工程与自动化学院,云南昆明650504 [2]云南省媒体融合重点实验室,云南昆明650228

出　　处：《陕西理工大学学报（自然科学版）》2024年第6期65-74,共10页Journal of Shaanxi University of Technology:Natural Science Edition

基　　金：云南省媒体融合重点实验室开放项目(220235205)。

摘　　要：针对大多数鲁棒性数字图像水印抵抗剪切攻击能力不佳的问题,提出了一种随机水印生成的抗剪切攻击彩色图像的鲁棒盲水印方法。首先利用灰度共生矩阵计算载体图像的能量和对比度,用能量和对比度的加权和构造适应度函数,使用遗传算法计算得到大小随机、纹理丰富的图像块生成水印信息,提高水印对剪切攻击的抵抗能力;然后结合DWT和之字形扫描聚类出低频区域高度相关的近似系数并对其进行向量化,将近似系数的向量分解为两个高度正相关的子向量;最后结合DCT修改系数矩阵嵌入水印信息,借助两个子向量的DCT系数矩阵实现差分提取,降低水印的提取难度。实验表明,该方法针对剪切攻击具有良好的鲁棒性,在峰值信噪比高于36 dB的情况下,提取的盲水印的归一化系数均在0.94以上。In response to the limited resistance of most robust digital image watermarking techniques against shear attacks,a robust blind watermarking method for color images is proposed in this paper.Initially,the Gray-Level Co-occurrence Matrix is employed to calculate the energy and contrast of the carrier image.An adaptive fitness function is constructed based on the weighted sum of energy and contrast,and a Genetic Algorithm is utilized to generate randomly sized and texture-rich image blocks for watermark information embedding,enhancing the resistance of the watermark against shear attacks.Subsequently,by integrating Discrete Wavelet Transform and zigzag scanning,low-frequency regions with highly correlated approximation coefficients are clustered and vectorized.The vectorized approximation coefficients are decomposed into two highly positively correlated sub-vectors.Finally,utilizing the Discrete Cosine Transform,the coefficient matrix is modified to embed the watermark information.Differential extraction is achieved by leveraging the Discrete Cosine Transform coefficient matrices of the two sub-vectors,reducing the difficulty of watermark extraction.Experimental results demonstrate that the proposed method exhibits excellent robustness against shear attacks,with normalized coefficients of the extracted blind watermark all exceeding 0.94 under conditions where the peak signal-to-noise ratio is higher than 36 dB.

关 键 词：盲水印 向量分解 差分提取 剪切攻击 图像水印 

分 类 号：TN911.7[电子电信—通信与信息系统]