Digital color image watermarking based on phase-shifting interferometry and neighboring pixel value subtraction algorithm in the discrete-cosine-transform domain.
Digital color image watermarking based on phase-shifting interferometry and neighboring pixel value subtraction algorithm in the discrete-cosine-transform domain.
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DOI：
10.1364/ao.46.004694
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发表时间：
2007-07
期刊：
影响因子：
1.9
通讯作者：
Xiangfeng Meng;L. Cai;X. Yang;Xian-Feng Xu;G. Dong;Xiaonong Shen;Hao Zhang;Yurong Wang
中科院分区：
文献类型：
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作者：
Xiangfeng Meng;L. Cai;X. Yang;Xian-Feng Xu;G. Dong;Xiaonong Shen;Hao Zhang;Yurong Wang
提出了一种基于相移干涉术（PSI）和离散余弦变换（DCT）域相邻像素值相减算法的数字光学单通道彩色图像水印算法。利用PSI和双随机相位编码技术，将原始彩色图像转换成二维索引图像矩阵，加密成四幅干涉图。然后在DCT域中将干涉图嵌入到放大的彩色宿主图像的一个选定通道中。通过DCT变换、改进的相邻像素值相减算法、逆加密过程和彩色图像格式转换，恢复隐藏的彩色图像。通过计算机仿真，验证了该方法的可行性，并分析了其对不同加权因子叠加图像的各种变形和攻击的鲁棒性。该方法避免了直接信息叠加带来的串扰噪声，增强了隐藏数据的不可感知性，提高了数据传输效率。
A novel single-channel color-image watermarking with digital-optics means based on phase-shifting interferometry (PSI) and a neighboring pixel value subtraction algorithm in the discrete-cosine-transform (DCT) domain is proposed. The converted two-dimensional indexed image matrix from an original color image is encrypted to four interferograms by a PSI and double random-phase encoding technique. Then the interferograms are embedded in one chosen channel of an enlarged color host image in the DCT domain. The hidden color image can be retrieved by DCT, the improved neighboring pixel value subtraction algorithm, an inverse encryption process, and color image format conversion. The feasibility of this method and its robustness against some types of distortion and attacks from the superposed image with different weighting factors are verified and analyzed by computer simulations. This approach can avoid the cross-talk noise due to direct information superposition, enhance the imperceptibility of hidden data, and improve the efficiency of data transmission.