Combining double random phase encoding for color image watermarking in quaternion gyrator domain
Combining double random phase encoding for color image watermarking in quaternion gyrator domain
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DOI：
10.1016/j.optcom.2015.01.002
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发表时间：
2015-05
影响因子：
2.4
通讯作者：
Zhuhong Shao;Y. Duan;G. Coatrieux;Jiasong Wu;Jinyu Meng;H. Shu
中科院分区：
文献类型：
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作者：
Zhuhong Shao;Y. Duan;G. Coatrieux;Jiasong Wu;Jinyu Meng;H. Shu
彩色图像的四元数表示法由于能够综合处理三种颜色通道而引起人们的极大关注。更广泛地说，在过去的几十年里，它已经成功地应用于多通道信号处理应用中。提出了一种基于四元数回转变换域的双随机相位编码(DRPE)的联合加密/水印系统。在该方案中，将RGB级水印图像与灰度水印图像一起编码成四元数矩阵，并通过DRPE进行加密，然后将加密数据融合到四元数回转器变换后的宿主图像的中间系数中。在提取水印的过程中，没有授权的密钥是不可能检索到的。与在分数阶富里叶域实现的三通道独立处理方法相比，该算法避免了重复运算，获得了较低的复杂度。实验结果证明了该算法的可行性及其在噪声稳健性方面的优越性能。
Quaternion representation of color image has attracted great attention due to its capability to treat holistically the three color channels. In a more general way, it has successfully been used in multi-channel signal processing applications over the past few decades. In this study, a joint encryption/watermarking system with more security based on double random phase encoding (DRPE) in quaternion gyrator transform domain is addressed. In the proposed scheme, an RGB-scale watermark image together with a grayscale watermark image or not is encoded into a quaternion matrix and encrypted through the DRPE, the encrypted data is then fused into the middle coefficients of the quaternion gyrator-transformed host image. In the process of extracting watermarks, it is impossible to retrieve them without authorized keys. Compared with the three channels independently processing approach implemented in fractional Fourier domain, the proposed algorithm achieves lower complexity by reason of avoiding repetitive operations. Experimental results have demonstrated the feasibility of the proposed algorithm and its superior performance in terms of noise robustness.